Update README: `transfer_admin` → `propose_admin`/`accept_admin` and add `treasury` parameter to `initialize`

[PrincessnJoy]

Description

The README contains two inaccuracies in the Governance Contract Reference section that will confuse developers integrating with the contract.

1. Admin Transfer Function Name

The README documents:

pub fn transfer_admin(env: Env, admin: Address, new_admin: Address) -> Result<(), ContractError>

The actual contract implements a two-step admin transfer using:

pub fn propose_admin(env: Env, admin: Address, new_admin: Address) -> Result<(), ContractError>
pub fn accept_admin(env: Env, pending_admin: Address) -> Result<(), ContractError>
pub fn cancel_admin_transfer(env: Env, admin: Address) -> Result<(), ContractError>

There is no transfer_admin function in the contract. Callers following the README will get a FunctionNotFound error.

2. Missing treasury Parameter in initialize

The README's initialize signature:

pub fn initialize(
    env: Env,
    admin: Address,
    voting_token: Address,
    min_proposal_balance: i128,
    proposal_cooldown: u64,
    min_quorum_bps: u32,
    restrict_admin_vote: bool,
) -> Result<(), ContractError>

The actual contract also accepts a treasury: Option<Address> parameter for the on-chain treasury disbursement feature, which is not documented.

Acceptance Criteria

• Replace the transfer_admin entry in the README with propose_admin, accept_admin, and cancel_admin_transfer, including correct signatures and a brief description of the two-step transfer flow
• Add the treasury: Option<Address> parameter to the initialize signature in the README, with a description of its purpose
• Cross-check all other function signatures in the README against the actual lib.rs and correct any additional discrepancies
• Ensure docs/api/governance.md is also updated to match (if it contains the same stale entries)
• make lint (or any doc linter) passes

Priority

Medium — documentation bug, not a runtime failure, but directly impacts developer experience.

Estimated Effort

Small